Cooling construction for cylinders



April 13 1926.

R; G. DYSON ET AL COOLING CONSTRUCTION FOR CYLINDERS Filed June 8, 1923J) 4 r 9 12% Z r fiozeri gar/vac)? W :Z/Zez'r a I The cylinder 4 maybody portion rib 6 in the Patented Apr. 13, 1926.

UNI'IT-EDIQST'ATES ROBERT PENNSYLVANIA, As

TOWN, PENNSYLVANIA,

* g 1 1,580,371 PATENT". oFFicE.

TROOPER, AND nevus. PLUMMER, or rAI tvI wvILtA oE, sreNoEs T0 ERANKLI IECOMPRESSOR wonxs, 0E Nonme- A CORPORATION OF PENNSYLVANIA.

COOLING CONSTRUCTION FOR CYLINDERS.

Application filed June 8, 1923.-

To all whom it may concern:

Be it known that we, and HARVEY S. PLUMMER, United States, 5 Trooper, inthe county State of lage, in the county of State of Pennsylvania, tainnew and useful Improvements ing Constructions Pennsylvania,

the following is a specification.

It is well known that the cylinders of air compressors, engines comeho-t during use and similar devices beand that it 1s necessary to coolsuch cylinders in order to prevent them from becoming overheated.

Various structures have been employed p prior to our mvention.

effecting s entirely s One object of our for the purpose 0 aid cooling,but they havenot been atisfactory.

invention is to provide a simple, durable and inexpensive constructionfor such cylinders which will effect the proper cooling thereof.

Another object. is to so form our invention that it can be readilymanufactured and will be of a practical and strong These objects andformation. other advantageous ends which will be set forth hereinafter,we attain in the following manner, reference'being had to theaccompanylng Figure drawing in which- 1 is a fragmentary elevation of anair compressor having a cylinder constructed 'in accordance with ourlnvention, and

Figure 2 is a section taken on the line Referring to the drawings, 3represents the body portion of an air compressor having an'uprightcylinder 4. Said cylinder may have the usual bore 5 in which the pistonoperates for efiecting the compression.

be cast integral with the 3 and includes an exterior form of a helix,the turns or 'convolutions of which start adjacent the lower part of thecylinder and, ascend as clearly shown in Figure 1 of the accompanyingdrawing. This elicalrib 6 is preferably cast integral with the cylinderand thus forms a helical groove 7 between the convolutions nating wi orturns of the rib 6, said groove lower end at 8 and termith its upper endat 9.

d the fulldepth of the groove.

f" so that the air, when passing Serial No. 644,283. A

It will be noted by reference to the drawing that the extreme ends8 and9 are flush with the outersurface of the cylinder; and extend graduallyinward until they reach On account of this'construction and especiallydue to such shape of the top end 9 of the groove, any heated air passingupward in the helical channel provided by the groove will be deflectedlaterally from the cylinder when reaching the top end portion 9 of thegroove and therefore the heated air will not pocket in the groove. Thusthe heated air quickly passes off and the cylinder is effectively keptcool.

Furthermore, we preferably taper the uper-end of the groove, as shown inFigure 1,

uppermost convolution of the groove, Wlll enter the tapered portionofthe groove and here again provision is made to cause the lateraldeflection of the heated air away from the cylinder. 7

Having thus described our invention, what we claim as new and desire tosecure .by Letters Patent is:

1. A cylinder having in its outer surface a helical cooling grooveexposed to the atmosphere, the convolutions of said groove extending inthe direction of the height of said cylinder, being flush with the outersurface of the cylinder and extending gradually inward until it reachesthe greatest depth of said groove, said groove being so formed as toproduce a helically projecting rib whose outer surface is in alignmentwith the outer surface of the cylinder. 2. A cylinder mosphere, theconvolutions of said groove extending in the dlrection of the height orhaving in its outer surface 7 a helical cooling groove exposed to theatthrough the said groove at its upper end 7 a helical cooling grooveexposed to the atmosphere, the convolutions of said groove extending inthe direction of the height of said cylinder and having itsupper endterminating Within the height of said cylinder, the intervening ribformed by said groove being flush With and blending into the surface ofthe top portion of said cylinder, whereby there is no projecting end ofthe rib toform an obstruction. 10

In testimony whereof We have signed our names to this specification.

ROBERT G. DYSON.

HARVEY S. PLUMMER.

